Add build script to get some Git info to later show in admin panel, and add some metadata to Cargo.toml

Cargo.toml

@@ -4,6 +4,12 @@ version = "1.0.0"
 authors = ["Daniel García <dani-garcia@users.noreply.github.com>"]
 edition = "2018"
 
+repository = "https://github.com/dani-garcia/bitwarden_rs"
+readme = "README.md"
+license = "GPL-3.0-only"
+publish = false
+build = "build.rs"
+
 [features]
 enable_syslog = ["syslog", "fern/syslog-4"]
 

build.rs

@@ -0,0 +1,39 @@
+use std::process::Command;
+
+fn main() {
+    read_git_info().expect("Unable to read Git info");
+}
+
+fn run(args: &[&str]) -> Result<String, std::io::Error> {
+    let out = Command::new(args[0]).args(&args[1..]).output()?;
+    Ok(String::from_utf8(out.stdout).unwrap().trim().to_string())
+}
+
+/// This method reads info from Git, namely tags, branch, and revision
+fn read_git_info() -> Result<(), std::io::Error> {
+    // The exact tag for the current commit, can be empty when
+    // the current commit doesn't have an associated tag
+    let exact_tag = run(&["git", "describe", "--abbrev=0", "--tags", "--exact-match"])?;
+    println!("cargo:rustc-env=GIT_EXACT_TAG={}", exact_tag);
+
+    // The last available tag, equal to exact_tag when
+    // the current commit is tagged
+    let last_tag = run(&["git", "describe", "--abbrev=0", "--tags"])?;
+    println!("cargo:rustc-env=GIT_LAST_TAG={}", last_tag);
+
+    // The current branch name
+    let branch = run(&["git", "rev-parse", "--abbrev-ref", "HEAD"])?;
+    println!("cargo:rustc-env=GIT_BRANCH={}", branch);
+
+    // The current git commit hash
+    let rev = run(&["git", "rev-parse", "HEAD"])?;
+    let rev_short = rev.get(..12).unwrap_or_default();
+    println!("cargo:rustc-env=GIT_REV={}", rev_short);
+
+    // To access these values, use:
+    //    env!("GIT_EXACT_TAG")
+    //    env!("GIT_LAST_TAG")
+    //    env!("GIT_BRANCH")
+    //    env!("GIT_REV")
+    Ok(())
+}